THE AXGIOSPERMAE : LEAVES 981 



winter buds of trees, which are often formed quite early in the preceding 

 summer. Inside these buds the development of leaf primordia for the next 



Fig. 972. — Bouhinio miiiuina. Bifid leaves. 

 {After Kerner.) 



season goes on until the dormant period begins in October or November. 

 When spring comes, the development of this preformed foliage is often 

 surprisingly rapid. In a few cases, such as the Horse Chestnut (Aesailus), 

 the whole of the foliage for a given season is prepared beforehand. In others 



